I've seen a number of coaches recommend the Beiter recurve sight tunnel because there's an optional accessory for a level for the 12mm size, while not legal for WA rounds, it's a good training component.
I have use the 12mm clear with crosshair for over 10 years for target archery, indoors and out.I really like it except i did not get on with it with on the black and white targets faces inddors, i swapped to a avalon tec 0ne 14mm sight that i use when field shooting. i did try the fiber but had to chop the end off so it didn't stick out more that 20mm, (FITA rule) the fiber worked well even with the most of it cut off. you can get a clip on spirit level bubble for this sight as well, but it is not allowed under FITA rules. it is handy for setting up offset weights on you stabilizers.
A pretty underrated recurve product IMO, ill definitely be getting one for my recurve FYI to those who want ome though, not all of them are legal for World Archery (Field in particular from memory)
Here is a Tip Steve . Ive spent thousands with you and my last three Order have been Cancelled due to no stock after ive paid online. I cant recommend you to any of my 70plus members and at least 30 have had issue with your store in the last 6 months . Its not Good Mate , I wont be ordering again anytime soon , hope you get your Business and new Website sorted out , Your losing loyal customers . not to mention $49 postage for 24 arrows and a few nocks and point is well over the Top. Helan has my email and details .